Mercurial > hg > graal-compiler
annotate src/share/vm/gc_implementation/g1/heapRegionRemSet.hpp @ 10182:5c93c1f61226
8011724: G1: Stack allocate instances of HeapRegionRemSetIterator
Summary: Stack allocate instances of HeapRegionRemSetIterator during RSet scanning.
Reviewed-by: brutisso, jwilhelm
| author | johnc |
|---|---|
| date | Thu, 18 Apr 2013 10:09:23 -0700 |
| parents | db823a892a55 |
| children | 6702da6b6082 |
| rev | line source |
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| 342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |
| 26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP | |
| 27 | |
| 28 #include "gc_implementation/g1/sparsePRT.hpp" | |
| 29 | |
| 342 | 30 // Remembered set for a heap region. Represent a set of "cards" that |
| 31 // contain pointers into the owner heap region. Cards are defined somewhat | |
| 32 // abstractly, in terms of what the "BlockOffsetTable" in use can parse. | |
| 33 | |
| 34 class G1CollectedHeap; | |
| 35 class G1BlockOffsetSharedArray; | |
| 36 class HeapRegion; | |
| 37 class HeapRegionRemSetIterator; | |
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38 class PerRegionTable; |
| 342 | 39 class SparsePRT; |
| 40 | |
| 2173 | 41 // Essentially a wrapper around SparsePRTCleanupTask. See |
| 42 // sparsePRT.hpp for more details. | |
| 43 class HRRSCleanupTask : public SparsePRTCleanupTask { | |
| 44 }; | |
| 342 | 45 |
| 46 // The "_coarse_map" is a bitmap with one bit for each region, where set | |
| 47 // bits indicate that the corresponding region may contain some pointer | |
| 48 // into the owning region. | |
| 49 | |
| 50 // The "_fine_grain_entries" array is an open hash table of PerRegionTables | |
| 51 // (PRTs), indicating regions for which we're keeping the RS as a set of | |
| 52 // cards. The strategy is to cap the size of the fine-grain table, | |
| 53 // deleting an entry and setting the corresponding coarse-grained bit when | |
| 54 // we would overflow this cap. | |
| 55 | |
| 56 // We use a mixture of locking and lock-free techniques here. We allow | |
| 57 // threads to locate PRTs without locking, but threads attempting to alter | |
| 58 // a bucket list obtain a lock. This means that any failing attempt to | |
| 59 // find a PRT must be retried with the lock. It might seem dangerous that | |
| 60 // a read can find a PRT that is concurrently deleted. This is all right, | |
| 61 // because: | |
| 62 // | |
| 63 // 1) We only actually free PRT's at safe points (though we reuse them at | |
| 64 // other times). | |
| 65 // 2) We find PRT's in an attempt to add entries. If a PRT is deleted, | |
| 66 // it's _coarse_map bit is set, so the that we were attempting to add | |
| 67 // is represented. If a deleted PRT is re-used, a thread adding a bit, | |
| 68 // thinking the PRT is for a different region, does no harm. | |
| 69 | |
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70 class OtherRegionsTable VALUE_OBJ_CLASS_SPEC { |
| 342 | 71 friend class HeapRegionRemSetIterator; |
| 72 | |
| 73 G1CollectedHeap* _g1h; | |
| 74 Mutex _m; | |
| 75 HeapRegion* _hr; | |
| 76 | |
| 77 // These are protected by "_m". | |
| 78 BitMap _coarse_map; | |
| 79 size_t _n_coarse_entries; | |
| 80 static jint _n_coarsenings; | |
| 81 | |
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82 PerRegionTable** _fine_grain_regions; |
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83 size_t _n_fine_entries; |
| 342 | 84 |
| 6253 | 85 // The fine grain remembered sets are doubly linked together using |
| 86 // their 'next' and 'prev' fields. | |
| 87 // This allows fast bulk freeing of all the fine grain remembered | |
| 88 // set entries, and fast finding of all of them without iterating | |
| 89 // over the _fine_grain_regions table. | |
| 90 PerRegionTable * _first_all_fine_prts; | |
| 91 PerRegionTable * _last_all_fine_prts; | |
| 92 | |
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93 // Used to sample a subset of the fine grain PRTs to determine which |
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94 // PRT to evict and coarsen. |
| 342 | 95 size_t _fine_eviction_start; |
| 96 static size_t _fine_eviction_stride; | |
| 97 static size_t _fine_eviction_sample_size; | |
| 98 | |
| 99 SparsePRT _sparse_table; | |
| 100 | |
| 101 // These are static after init. | |
| 102 static size_t _max_fine_entries; | |
| 103 static size_t _mod_max_fine_entries_mask; | |
| 104 | |
| 105 // Requires "prt" to be the first element of the bucket list appropriate | |
| 106 // for "hr". If this list contains an entry for "hr", return it, | |
| 107 // otherwise return "NULL". | |
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108 PerRegionTable* find_region_table(size_t ind, HeapRegion* hr) const; |
| 342 | 109 |
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110 // Find, delete, and return a candidate PerRegionTable, if any exists, |
| 342 | 111 // adding the deleted region to the coarse bitmap. Requires the caller |
| 112 // to hold _m, and the fine-grain table to be full. | |
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113 PerRegionTable* delete_region_table(); |
| 342 | 114 |
| 115 // If a PRT for "hr" is in the bucket list indicated by "ind" (which must | |
| 116 // be the correct index for "hr"), delete it and return true; else return | |
| 117 // false. | |
| 118 bool del_single_region_table(size_t ind, HeapRegion* hr); | |
| 119 | |
| 120 // Indexed by thread X heap region, to minimize thread contention. | |
| 121 static int** _from_card_cache; | |
| 122 static size_t _from_card_cache_max_regions; | |
| 123 static size_t _from_card_cache_mem_size; | |
| 124 | |
| 6253 | 125 // link/add the given fine grain remembered set into the "all" list |
| 126 void link_to_all(PerRegionTable * prt); | |
| 127 // unlink/remove the given fine grain remembered set into the "all" list | |
| 128 void unlink_from_all(PerRegionTable * prt); | |
| 129 | |
| 342 | 130 public: |
| 131 OtherRegionsTable(HeapRegion* hr); | |
| 132 | |
| 133 HeapRegion* hr() const { return _hr; } | |
| 134 | |
| 135 // For now. Could "expand" some tables in the future, so that this made | |
| 136 // sense. | |
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137 void add_reference(OopOrNarrowOopStar from, int tid); |
| 342 | 138 |
| 139 // Removes any entries shown by the given bitmaps to contain only dead | |
| 140 // objects. | |
| 141 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 142 | |
| 143 // Not const because it takes a lock. | |
| 144 size_t occupied() const; | |
| 145 size_t occ_fine() const; | |
| 146 size_t occ_coarse() const; | |
| 147 size_t occ_sparse() const; | |
| 148 | |
| 149 static jint n_coarsenings() { return _n_coarsenings; } | |
| 150 | |
| 151 // Returns size in bytes. | |
| 152 // Not const because it takes a lock. | |
| 153 size_t mem_size() const; | |
| 154 static size_t static_mem_size(); | |
| 155 static size_t fl_mem_size(); | |
| 156 | |
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157 bool contains_reference(OopOrNarrowOopStar from) const; |
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158 bool contains_reference_locked(OopOrNarrowOopStar from) const; |
| 342 | 159 |
| 160 void clear(); | |
| 161 | |
| 162 // Specifically clear the from_card_cache. | |
| 163 void clear_fcc(); | |
| 164 | |
| 165 // "from_hr" is being cleared; remove any entries from it. | |
| 166 void clear_incoming_entry(HeapRegion* from_hr); | |
| 167 | |
| 2173 | 168 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); |
| 169 | |
| 342 | 170 // Declare the heap size (in # of regions) to the OtherRegionsTable. |
| 171 // (Uses it to initialize from_card_cache). | |
| 172 static void init_from_card_cache(size_t max_regions); | |
| 173 | |
| 174 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
| 175 // Make sure any entries for higher regions are invalid. | |
| 176 static void shrink_from_card_cache(size_t new_n_regs); | |
| 177 | |
| 178 static void print_from_card_cache(); | |
| 179 }; | |
| 180 | |
| 6197 | 181 class HeapRegionRemSet : public CHeapObj<mtGC> { |
| 342 | 182 friend class VMStructs; |
| 183 friend class HeapRegionRemSetIterator; | |
| 184 | |
| 185 public: | |
| 186 enum Event { | |
| 187 Event_EvacStart, Event_EvacEnd, Event_RSUpdateEnd | |
| 188 }; | |
| 189 | |
| 190 private: | |
| 191 G1BlockOffsetSharedArray* _bosa; | |
| 192 G1BlockOffsetSharedArray* bosa() const { return _bosa; } | |
| 193 | |
| 194 OtherRegionsTable _other_regions; | |
| 195 | |
| 196 enum ParIterState { Unclaimed, Claimed, Complete }; | |
| 1261 | 197 volatile ParIterState _iter_state; |
| 198 volatile jlong _iter_claimed; | |
| 342 | 199 |
| 200 // Unused unless G1RecordHRRSOops is true. | |
| 201 | |
| 202 static const int MaxRecorded = 1000000; | |
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203 static OopOrNarrowOopStar* _recorded_oops; |
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204 static HeapWord** _recorded_cards; |
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205 static HeapRegion** _recorded_regions; |
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206 static int _n_recorded; |
| 342 | 207 |
| 208 static const int MaxRecordedEvents = 1000; | |
| 209 static Event* _recorded_events; | |
| 210 static int* _recorded_event_index; | |
| 211 static int _n_recorded_events; | |
| 212 | |
| 213 static void print_event(outputStream* str, Event evnt); | |
| 214 | |
| 215 public: | |
| 216 HeapRegionRemSet(G1BlockOffsetSharedArray* bosa, | |
| 217 HeapRegion* hr); | |
| 218 | |
| 219 static int num_par_rem_sets(); | |
| 1261 | 220 static void setup_remset_size(); |
| 342 | 221 |
| 222 HeapRegion* hr() const { | |
| 223 return _other_regions.hr(); | |
| 224 } | |
| 225 | |
| 226 size_t occupied() const { | |
| 227 return _other_regions.occupied(); | |
| 228 } | |
| 229 size_t occ_fine() const { | |
| 230 return _other_regions.occ_fine(); | |
| 231 } | |
| 232 size_t occ_coarse() const { | |
| 233 return _other_regions.occ_coarse(); | |
| 234 } | |
| 235 size_t occ_sparse() const { | |
| 236 return _other_regions.occ_sparse(); | |
| 237 } | |
| 238 | |
| 239 static jint n_coarsenings() { return OtherRegionsTable::n_coarsenings(); } | |
| 240 | |
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241 // Used in the sequential case. |
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242 void add_reference(OopOrNarrowOopStar from) { |
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243 _other_regions.add_reference(from, 0); |
| 342 | 244 } |
| 245 | |
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246 // Used in the parallel case. |
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247 void add_reference(OopOrNarrowOopStar from, int tid) { |
| 342 | 248 _other_regions.add_reference(from, tid); |
| 249 } | |
| 250 | |
| 251 // Removes any entries shown by the given bitmaps to contain only dead | |
| 252 // objects. | |
| 253 void scrub(CardTableModRefBS* ctbs, BitMap* region_bm, BitMap* card_bm); | |
| 254 | |
| 255 // The region is being reclaimed; clear its remset, and any mention of | |
| 256 // entries for this region in other remsets. | |
| 257 void clear(); | |
| 258 | |
| 259 // Attempt to claim the region. Returns true iff this call caused an | |
| 260 // atomic transition from Unclaimed to Claimed. | |
| 261 bool claim_iter(); | |
| 262 // Sets the iteration state to "complete". | |
| 263 void set_iter_complete(); | |
| 264 // Returns "true" iff the region's iteration is complete. | |
| 265 bool iter_is_complete(); | |
| 266 | |
| 1261 | 267 // Support for claiming blocks of cards during iteration |
| 268 size_t iter_claimed() const { return (size_t)_iter_claimed; } | |
| 269 // Claim the next block of cards | |
| 270 size_t iter_claimed_next(size_t step) { | |
| 271 size_t current, next; | |
| 272 do { | |
| 273 current = iter_claimed(); | |
| 274 next = current + step; | |
| 275 } while (Atomic::cmpxchg((jlong)next, &_iter_claimed, (jlong)current) != (jlong)current); | |
| 276 return current; | |
| 277 } | |
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278 void reset_for_par_iteration(); |
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279 |
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280 bool verify_ready_for_par_iteration() { |
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281 return (_iter_state == Unclaimed) && (_iter_claimed == 0); |
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282 } |
| 1261 | 283 |
| 342 | 284 // The actual # of bytes this hr_remset takes up. |
| 285 size_t mem_size() { | |
| 286 return _other_regions.mem_size() | |
| 287 // This correction is necessary because the above includes the second | |
| 288 // part. | |
| 289 + sizeof(this) - sizeof(OtherRegionsTable); | |
| 290 } | |
| 291 | |
| 292 // Returns the memory occupancy of all static data structures associated | |
| 293 // with remembered sets. | |
| 294 static size_t static_mem_size() { | |
| 295 return OtherRegionsTable::static_mem_size(); | |
| 296 } | |
| 297 | |
| 298 // Returns the memory occupancy of all free_list data structures associated | |
| 299 // with remembered sets. | |
| 300 static size_t fl_mem_size() { | |
| 301 return OtherRegionsTable::fl_mem_size(); | |
| 302 } | |
| 303 | |
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304 bool contains_reference(OopOrNarrowOopStar from) const { |
| 342 | 305 return _other_regions.contains_reference(from); |
| 306 } | |
| 307 void print() const; | |
| 308 | |
| 309 // Called during a stop-world phase to perform any deferred cleanups. | |
| 310 static void cleanup(); | |
| 311 | |
| 312 // Declare the heap size (in # of regions) to the HeapRegionRemSet(s). | |
| 313 // (Uses it to initialize from_card_cache). | |
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314 static void init_heap(uint max_regions) { |
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315 OtherRegionsTable::init_from_card_cache((size_t) max_regions); |
| 342 | 316 } |
| 317 | |
| 318 // Declares that only regions i s.t. 0 <= i < new_n_regs are in use. | |
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319 static void shrink_heap(uint new_n_regs) { |
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320 OtherRegionsTable::shrink_from_card_cache((size_t) new_n_regs); |
| 342 | 321 } |
| 322 | |
| 323 #ifndef PRODUCT | |
| 324 static void print_from_card_cache() { | |
| 325 OtherRegionsTable::print_from_card_cache(); | |
| 326 } | |
| 327 #endif | |
| 328 | |
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329 static void record(HeapRegion* hr, OopOrNarrowOopStar f); |
| 342 | 330 static void print_recorded(); |
| 331 static void record_event(Event evnt); | |
| 332 | |
| 2173 | 333 // These are wrappers for the similarly-named methods on |
| 334 // SparsePRT. Look at sparsePRT.hpp for more details. | |
| 335 static void reset_for_cleanup_tasks(); | |
| 336 void do_cleanup_work(HRRSCleanupTask* hrrs_cleanup_task); | |
| 337 static void finish_cleanup_task(HRRSCleanupTask* hrrs_cleanup_task); | |
| 338 | |
| 342 | 339 // Run unit tests. |
| 340 #ifndef PRODUCT | |
| 341 static void test(); | |
| 342 #endif | |
| 343 }; | |
| 344 | |
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345 class HeapRegionRemSetIterator : public StackObj { |
| 342 | 346 |
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347 // The region RSet over which we're iterating. |
| 342 | 348 const HeapRegionRemSet* _hrrs; |
| 349 | |
| 350 // Local caching of HRRS fields. | |
| 351 const BitMap* _coarse_map; | |
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352 PerRegionTable** _fine_grain_regions; |
| 342 | 353 |
| 354 G1BlockOffsetSharedArray* _bosa; | |
| 355 G1CollectedHeap* _g1h; | |
| 356 | |
| 357 // The number yielded since initialization. | |
| 358 size_t _n_yielded_fine; | |
| 359 size_t _n_yielded_coarse; | |
| 360 size_t _n_yielded_sparse; | |
| 361 | |
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362 // Indicates what granularity of table that we're currently iterating over. |
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363 // We start iterating over the sparse table, progress to the fine grain |
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364 // table, and then finish with the coarse table. |
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365 // See HeapRegionRemSetIterator::has_next(). |
| 342 | 366 enum IterState { |
| 367 Sparse, | |
| 368 Fine, | |
| 369 Coarse | |
| 370 }; | |
| 371 IterState _is; | |
| 372 | |
| 373 // In both kinds of iteration, heap offset of first card of current | |
| 374 // region. | |
| 375 size_t _cur_region_card_offset; | |
| 376 // Card offset within cur region. | |
| 377 size_t _cur_region_cur_card; | |
| 378 | |
| 379 // Coarse table iteration fields: | |
| 380 | |
| 381 // Current region index; | |
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382 int _coarse_cur_region_index; |
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383 size_t _coarse_cur_region_cur_card; |
| 342 | 384 |
| 385 bool coarse_has_next(size_t& card_index); | |
| 386 | |
| 387 // Fine table iteration fields: | |
| 388 | |
| 389 // Index of bucket-list we're working on. | |
| 390 int _fine_array_index; | |
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391 |
| 342 | 392 // Per Region Table we're doing within current bucket list. |
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393 PerRegionTable* _fine_cur_prt; |
| 342 | 394 |
| 395 /* SparsePRT::*/ SparsePRTIter _sparse_iter; | |
| 396 | |
| 397 void fine_find_next_non_null_prt(); | |
| 398 | |
| 399 bool fine_has_next(); | |
| 400 bool fine_has_next(size_t& card_index); | |
| 401 | |
| 402 public: | |
| 403 // We require an iterator to be initialized before use, so the | |
| 404 // constructor does little. | |
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405 HeapRegionRemSetIterator(const HeapRegionRemSet* hrrs); |
| 342 | 406 |
| 407 // If there remains one or more cards to be yielded, returns true and | |
| 408 // sets "card_index" to one of those cards (which is then considered | |
| 409 // yielded.) Otherwise, returns false (and leaves "card_index" | |
| 410 // undefined.) | |
| 411 bool has_next(size_t& card_index); | |
| 412 | |
| 413 size_t n_yielded_fine() { return _n_yielded_fine; } | |
| 414 size_t n_yielded_coarse() { return _n_yielded_coarse; } | |
| 415 size_t n_yielded_sparse() { return _n_yielded_sparse; } | |
| 416 size_t n_yielded() { | |
| 417 return n_yielded_fine() + n_yielded_coarse() + n_yielded_sparse(); | |
| 418 } | |
| 419 }; | |
| 420 | |
| 1972 | 421 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONREMSET_HPP |